Gymnolomia. COMPOSITJE. 269 



long: akenes acutely angled and with few or obscure intermediate nerves, very smooth, the 

 3 or 4 angles extended into a pappus of as many short and blunt teeth, which are barely 

 coroniform-confiuent at base. — Lond. Jour. Bot. vi. 24.'); Gray in Pacif. R. Rep. iv. 102, & 

 Proc. Am. Acad. viii. 653. — S. Colorado and New Mexico to Utah and Wyoming, Geyer, 

 Bigcloiv, Parnj, Ward, &c. 



101. GYMNOLOMIA, IIBK. (Tvixv6^, naked, Ao./^a, border, the pappus 

 obsolete or none.) — Herbs or frutescent plants (of Mexico and adjacent coun- 

 tries), resembling the smaller-flowered species of Helianthus ; with erect branch- 

 ing stems, alternate or opposite leaves, and heads of yellow flowers (or the disk 

 brownisli) ; the peduncles terminating the branches : fl. summer. — Nov. Gen. & 

 Spec. iv. 217, t. 373,374; Benth. & Hook. Gen, ii. 363. Gymnopsis, DC. 

 Prodr. V. 5G1, in part. 



* Annuals: receptacle of tlie head conical and the disk high: bracts of the rather .simple involucre 

 linear. — Htliomtrh, Nutt. 



G. Porteri, Gr.vy. a foot or two high, slender, paniculately branched, sparingly hispid, 

 otherwise nearly glabrous : leaves nearly all alternate, narrowly lanceolate or linear, entire : 

 rays 5 to 8, oval or obovate (half-inch or more long), deep orange yellow : disk in age oblong- 

 conical ; its chaffy bracts oblong-lanceolate or the outer ovate, cuspidate-acuminate, striate, 

 merely concave at maturity : fructiferous receptacle almost columnar : akenes turgid-obovate, 

 very obscurely quadrangular, dull, somewhat jjuberulent, with small terminal areola, one of 

 the angles or nerves sometimes slightly margined or umbouate at the summit : style-tips 

 subulate and hispid. — Proc. Am. Acad. xii. 59 ; Meehau, Nat. Flowers, ser. 2, ii. t. 35. — liud- 

 beckiu ? Porteri, Gray, PI. Fendl. S3. — Northern Georgia, known only on the isolated granite 

 rock called Stone ftlountain, near Atlanta, where it abounds ; first coll. by Prof. Porter. 



G. multiflora, Bexth. & Hook. A foot to a yard high, strigulose-pubescent or scabrous, 

 sometimes also hispid, often much branched : leaves from narrowly linear to lanceolate, 

 rarely broader, either alternate or mainly opposite, entire or obscurely denticulate : rays 

 10 to 15, golden yellow : disk hemispherical, in age little more elevated and receptacle ob- 

 tusely conical ; its bracts obtuse or the inner acute with soft acumination : akenes smooth, 

 com])re.ssed, with convex or obtusely angulatc sides : style-tips short and obtuse. — Benth. & 

 Hook, ex Rothrock in Wheeler Rep. vi. ICO, & Ilcmsl. Biol. Centr.-Am. ii. 162. Heliomeris 

 viuiti flora, Nutt. he; Gray, PI. Fendl., PI. AVright. ii. 87, with var. /i/s/)?(/a, &c. — Sandy 

 banks of streams, &c., W. Texas to Wyoming, Nevada, and Arizona. Very polymorphous: 

 the root not pei'enuial as was supposed. An indigenous specimen coll. by Leminon in Arizona 

 has disk-corollas all converted into rays or radiatiforra ampliate lobes. (Mex.) 



G. triloba, Gp>ay. Much branched, over 2 feet high (root not seen), obscurely puberulent, 

 no hisijid bristles : leaves roundish in ger.eral outline, 3-lobed, with subcordate or truncate 

 base, short-petioled, the lobes short and broad: rajs 12 or more, oblong-linear, elongated: 

 disk hemispherical : receptacle low-conical : akenes of the preceding but more oblong. — 

 Proc. Am. Acad. xvii. 217 — Mountains of S. Arizona south of Pucker's A'alley, Lemmon. 



* * Perennial or frutescent: disk and receptacle low. 



G. tenuifolia, Bknth. & Hook. Shrubby, much branched, 2 or 3 feet high, scabrous- 

 j)nbcrulent, very leafy: branches terminated by solitary long-peduncled heads : leaves alter- 

 nate and the lower opposite, cancscent beneath, pinnately or pedateiy parted into 3 to 7 

 narrow linear lobes, or the uppermost very narrow and entire, the margins mostly revolute : 

 bracts of the involucre subulate-linear: rays 10 to 16: disk convex: chaffy bracts of the 

 receptacle truncate-obtuse: akenes smooth, quadrangular-compressed. — Ex Hemsl. Biol. 

 Centr.-Am. 1. c. Ilrliomeris tenui folia, (J ray, PI. Fendl. 84, PI. Wright, &c.— S. W. Texas, 

 Wriijld, Huvard. (Adj. Mex., Berlandicr, Grpcjg, &,c.) 



* * * Annual: receptacle and disk barely convex: hahlt oi Encelia and JTi lie nlJms. 



G. encelioid.es, Gray, a foot or two high from an annual root, strigose-cane.scent and 

 the branching stem hispid : leaves ovate-oblong or obscurely deltoid, rather obtuse, nearly 

 entire, mostly long-petioled, the lower opposite : heads barely half-inch high : involucre bi- 

 serial ; outer bracts all equal and equalling the disk, oblong-lanceolate, acute, white with soft 



